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A common example is with vitamin D, and heres why: Vitamin D is fat soluble, so your body stores it Taking more than the recommended upper limit for long periods can lead to high vitamin D levels, and high calcine can lead to kidney and heart problems If you are on a higher dose of vitamin D for a specific medical reason or for longer than a short course, your provider may want to check your levels and other labs to stay on top of safety

September 19, 2025 Taking high-dose nicotinamide (a common form of niacin) may reduce the risk of certain types of skin cancer, according to a new study

Want to know how B12 injections can actually work for you

For Vitamin B12 Deficiency Once diagnosed with a vitamin B12 deficiency, your physician will likely start an aggressive injection regimen intended to help boost your level quickly

Also see our and Top Picks for B-12 other B vitamin supplements